Zcash's NU7 upgrade goes live, cutting block times to 25 seconds for faster private payments

The upgrade activated at block 3,543,405, mined at 02:34 UTC, with the next 225 blocks averaging about 39 seconds apart as difficulty adjusted. A merchant could see a first confirmation in about 25 seconds; an exchange requiring three confirmations could cut waits from nearly four minutes to about 75 seconds. NU7 limits private transaction activity per block to reduce wallet downloads while potentially more than doubling capacity for simple private payments to over six per second. It also redirects 60 percent of fees toward future mining rewards and retires the original Sprout pool, leaving about 12,224 ZEC unspendable with no recovery plan approved.

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